<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            margin: 0px;
            padding: 0px;
            overflow-y: scroll;
            height: 100%;
            background-color: #8ddad3
        }
    </style>
</head>
<body>
    <ul>
        <li>
            <a href="#" data-url="./content.html">主页</a>
        </li>
        <li>
            <a href="#" data-url="./menu/page1.html">菜单1</a>
        </li>
        <li>
            <a href="#" data-url="./menu/page2.html">菜单2</a>
        </li>
        <li>
            <a href="#" data-url="./menu/page3.html">菜单3</a>
        </li>
        <li>
            <a href="#" data-url="./menu/page4.html">菜单4</a>
        </li>
    </ul>
    <script src="./node_modules/jquery/dist/jquery.js"></script>
    <script>
        $("a").click(function(){
            var url = $(this).attr("data-url");
            window.parent.frames[2].open(url, "_self", "", false);
        });
    </script>
</body>
</html>